Martin R. Bridson is the Whitehead Professor of Pure Mathematics at the University of Oxford. In 2006 he was awarded the Royal Society's Wolfson Research Merit Award. Peter H. Kropholler is Professor of Pure Mathematics at the University of Glasgow. Ian J. Leary is Professor in the Department of Mathematics at Ohio State University.

• Preface; List of participants; 1. Notes on Sela's work: limit groups and Makanin-Razborov diagrams M. Bestvina and M. Feighn; 2. Solutions to Bestvina & Feighn's exercises on limit groups H. Wilton; 3. L2-Invariants from the algebraic point of view W. Lück; 4. Constructing non-positively curved spaces and groups J. McCammond; 5. Homology and dynamics in quasi-isometric rigidity of once-punctured mapping class groups L. Mosher; 6. Hattori-Stallings trace and Euler characteristics for groups I. Chatterji and G. Mislin; 7. Groups of small homological dimension and the Atiyah conjecture P. H. Kropholler, P. Linnell and W. Lück; 8. Logarithms and assembly maps on Kn(Zl[G]) V. P. Snaith; 9. On complete resolutions O. Talelli; 10. Structure theory for branch groups J. S. Wilson.